#include <stdio.h>
int main() {
int alp[26]={0};
char str1[1001],str2[1001];
int total=0;
scanf("%s %s",str1, str2);
for(int i=0; str1[i]!=0; i++) {
int idx=str1[i]-'a';
alp[idx]+=1;
}
for(int i=0; str2[i]!=0; i++) {
int idx=str2[i]-'a';
alp[idx]-=1;
}
for(int i=0;i <26; i++) {
if(alp[i]>0) total+=alp[i];
else total-=alp[i];
}
printf("%d",total);
return 0;
}
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